CLUSTER.doc
Explanation of cluster.dat - measurements for 3
inventories (at ages 2, 3, and 4) by each cluster.
The loblolly pine seedlings that were
originally planted in 1998 were obtained from the International Paper Co.
nursery in Bluff City, AR. The
shortleaf pine seedlings that were originally planted in 1998 came from a
nursery in Missouri that is operated by the Missouri Forest Commission. Seedlings replanted in 1999 came from the
Arkansas Forest Commission’s Baucum nursery located in Little Rock.
Units:
English
Variables:
18
Columns:
1. Site
Area
One is
clusters 1 thru 675 with an area of 9.33 acres for hay alleys and 3.59 acres
for the tree clusters
Area
Two is clusters 676 thru 819 with an area of 1.79 acres for hay alleys and 0.77
acres
for the tree clusters
Area
Three is clusters 820 thru 1230 with an area of 5.74 acres for hay alleys and
2.19
acres for the tree clusters
Area
Four is clusters 1231 thru 1340 with an area of 1.52 acres for hay alleys and
0.59
acres for the tree clusters
2.
Area - amount of acreage within each site.
3.
Cluster number
4. Age - age of trees from seed. 1-0
genetically superior seedlings were planted.
Shortleaf seedlings were obtained from a nursery in Missouri. The loblolly pine seedlings were obtained
from . One complication is that during
the first two years of this study seedlings were replanted where other
seedlings had died. Therefore
cluster-level variables for age 3 may actually have some age 2 trees within
their measurements, etc.
5. Row - distance between central and adjacent
tree rows (0 (no adjacent rows), 4, or 6 feet).
6. Density - distance between crop trees and
nurse trees within cluster lines (3, 6, 8, or 12
feet).
7. Shortleaf pine thinning (shortthi)-
scheduled level of thinning intensity (0 - no thinning, 1 - thinning half of
the nurse trees as soon as they can be sold as long pulpwood (minimum
requirement is 4" with bark at the height of 25', 2 - thinning all nurse
trees as soon as they reach the size of long pulpwood.)
8. Loblolly pine pruning (lobprune) - scheduled
pruning operations are as follows:
==========================================================
Level
----------------------------------------------------------------------
Height Age 0 1 2
----------------------------------------------------------------------
Pruned length Pruned
length Pruned length
------------------------------------------------------------------------------------------------
16 5 0
8 (50%) 9.5
(60%)
24 8 0 12
(50%) 16 (67%)
32 11 0 16
(50%) 21 (67%)
==========================================================
9. Species - 0 - is
loblolly pine. 1 - is shortleaf pine.
10. Alive (1998) - the number of pine seedlings
that survived in 1998.
11. Planted (1998) - the number of pine
seedlings planted in 1998.
12. Alive (1999) - the number of pine seedlings
that survived in 1999.
13. Planted (1999) - the number of pine
seedlings planted in 1999.
14. Alive (2000) - the number of pine seedlings
that survived in 2000.
15. Planted (2000) - the number of pine
seedlings planted in 2000.
16. Avergld - The arithmetic mean ground-line diameter
by cluster (in inches).
17. Stdgld - standard deviation of the average
gld.
18. Averdbh - The arithmetic mean diameter at
breast height by cluster (in inches).
19. Stddbh - standard deviation of the average
dbh.
20. QMD - quadratic mean diameter (in inches).
21. Arithht - The arithmetic total tree height
by cluster (in feet).
Example:
1 12.92
2 4 4 3 2
1 0 15 24 17
18 19 24 1.70 0.00
0.60 0.14 0.62
6.9
Number of observations: 8040
The following code can be used to input
cluster.dat into SAS:
data cluster ; infile 'c:/cluster.dat' ; input site area
cluster age row density shortthi lobprune species alive98 plant98 alive99
plant99 alive00 plant00 avergld stdgld averdbh stddbh qmd arithht ; run ;